Fry sausage in skillet. Spread sausage evenly over bottom of skillet when fried. Pour egg mixture over sausage. Keep burner on low. Cover and cook until egg is set. After omelet is well puffed and slightly brown on bottom, crease omelet. Fold! Serve at once. If desired, one-half of omelet may be covered with 1/2 cup grated cheese, before folding.